Citing GMP in a Paper

Hello all,
I am working on a paper that makes extensive use of GMP and MPFR for its numerical calculations. The MPFR team has an article [1] that one can cite as a reference, and I was wondering if GMP had something similar. Is there a paper, article, book, etc. that I could cite about GMP, or some other preferred citation method? For instance, I found the following book [2], which already has several citations. Would this be appropriate?
Cheers,
Jacob Garber
[1] https://dl.acm.org/citation.cfm?doid=1236463.1236468
[2] https://dl.acm.org/citation.cfm?id=2911024